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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b6c57ec9f224b78d98918cfe96786cf20facd7c584fc933db712b0aaff9c79' 
  AND token = 'flErYwKyzTzQybjU94TznSbHem8iKrDM7BNkMMPsWSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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