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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59833e8f779f6bb44e91ecba4cb149c8856d39654fd96dcb2cb0db064ecb8bce' 
  AND token = '3nDLS1X25GwqPyTFU0UR9TusDC0B/LrtVr1GKFt6j+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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