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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affaff0e3a555cce47dd85439fc2604d242df71abada2a6a795d19d5782d6ddb' 
  AND token = 'JBpvUe01TFFi9Cbf2qn9ICRSdteK5iBC3QhNcJWD6mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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