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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d3f43c4210be03c6c6bc62b6470bcea211226c95d5c8f83f68ea06c16230dd' 
  AND token = 'zbonjz3U+bSHY5UGwLBCMWyrTk6dPebI5AWhMALk2Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}