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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555fa08e64f969dd01c79983b4551e6df7f3ac65ab6f5ce583380f7f2879eab0' 
  AND token = 'PR5kxLfsEA0xoFFvYyRsjOC1CaVyjQrrWxkd8B/QPgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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