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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36666d316270469f690fc468b428c196cbcc50dcb66b638e9762e18ee188ffa' 
  AND token = 'nq0NdQAFGivE+JJ+fgeUZi6WQB4Mz5EE/C0u7RJj2/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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