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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3060bb559a9facf564ae42d92a339757fc0d5a1cc67e1a93ba37a74c54c70715' 
  AND token = 'jLWNYYKYAoXrO9rtd4ximO/TDx1v5ANT6fDz9sDub9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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