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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6cb490e2cfb92d7cce3f9c570c636f675b7b5e01464f4c61f9c8d28f3cb89a' 
  AND token = 'qQBkMx1lNQmcegR4CjNh3+/rqAHtmYdysok4kTOOIpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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