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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446ccec8682b9fde17e80ec413b5146980dc096b2bda1938c30f80a9f1bd2f3a' 
  AND token = '9eSJ3n/RyPJ+GSP9JSxWGX/UHLrLzGLWvEhGaUTlgIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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