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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb811fe48972d3c499616af8c262dd711eb983fa7ca5619c5285ab82e7ba1f9b' 
  AND token = 'y7jcvmZNBAMOiIu8W5A9Pahr4bWwNVQCOYmOEXWn/vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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