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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0952079adfab8eba043a8d28f106b006eeb02b34e4f69fbc7f98a1bd076bf2' 
  AND token = 'V7nX87exqOv6ESkvONS2jC+Sq4RsAn6EXwWNOHzZ2Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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