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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f673611813c3b62e93ff2026fede4d538e088222007737481c749699f3ee9b' 
  AND token = '9V4CDwWO0rQpjIWqtn0JtYuPnabKLScGeYvkrymvIKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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