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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef0c520ed8c4a701e7a45ea749339c458532c68cf8887c77e65013e1247a8ca' 
  AND token = '1ljUXJZBCagXjloXC2Ai78jd2Z7X8er/ymEM9ZCXwiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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