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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfb9aedac3727398c47e9f2a6d28e3e85c1881c4bbff19e238d9ed4c3f53b74' 
  AND token = 'rbGuBJLbH/PomXoqzaU9MtRaLeCr6RDUnVoI09BkOcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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