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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beeca33947df58b8f7774be9da7c710758cd1e87876813ce3ed687be5c636934' 
  AND token = 'B8Zi9GkQL6rLJhW2rGI+N1MRm3fejWj3RikCJsbfp3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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