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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53229ac75ec86dd4df8627a33d0d8f9be9e326dc691df4dd1cf677fde34918f' 
  AND token = 'MMjeM1DeAQzBBwtqveIIudllJvSSCHdErZ12G8m6wLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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