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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89bd67d7d96927f40e0356ba9567677ec6f39011ed3bed15c42ed59041f027f7' 
  AND token = 'OL+h2D8MZZUlqgXteM4tAcMYoRX1tO5cm7XTqVGScGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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