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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5107a31b8549b6d7e7cb1fb9aeb179e6da4ebf83a366cee9d8eaaebc8a93d8d9' 
  AND token = 'NotAhOxTmwb+4lM4t051Ad1ppo5p7jwC5QnsQ8zBJh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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