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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4cdb1a36d1e64781b4e4edd83e27848e6c24c4ddbfb8b9db0587e248f6bf5d' 
  AND token = 'lgR7nl1qtdY7hR6v27qqO4liz1amYPOPnCqtCv2thu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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