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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76442ae5af9b6e8b252ae96398bcd97436e395e98cf625dcec2dc4f6a7be09df' 
  AND token = 'IUr9KvJnt1tNdXWG/mrW5iE4/KOxczCk7Jh0/ecYIfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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