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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4448c6da65eb4e0424079411da9f1a2e9b197ec86964b10cacb532f42af4e4a' 
  AND token = '3nyeKDOhq2oRHmlwkyl5xZO+Wu5DaKyqFU6Sn88Xqbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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