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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6292562c570b81d9f2c847c634411aa6107395752e83e25ed71693f87d6b529e' 
  AND token = 'kdoM8CmcQ956a+WdGBoMvxxOxdFpA0pAZWij2uPisP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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