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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f472bcdaa8cf638082cfc64d2b1d9fd82a8417f2417ae854e136cb940d6fcd34' 
  AND token = 'jJfs1jKuhrEt3Yqze1oew0Lb5z4iP3jO0RxBoMvAIyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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