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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce60bc970280455f323ab7e9525872a044098e0f55cd0b5cbb6dcf9eccda297b' 
  AND token = 'W8HIS3Pdo5RfBjpLi8mIYJRXm6N1MfU4Od7D2GHLEvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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