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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c898e577e1d7da993394a8d9c09e03263a79ea2ba3c8e7f7e9d064dd7cdca570' 
  AND token = 'eMXJx3bWhAUoGbGj+B8FmKhawhPJPVohedUVhK5hPno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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