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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ddc983311a2e64a2cc90c804191f9f36f8e9de1bdf708a5680a4ee1bb01b27' 
  AND token = 'wTf0jA2qS3AR0Yvu+lYKCw9MmjC76JSX6Jci3w8lkys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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