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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebb26fd0033e42b7b0cd4ce6f62245ca692c11398699f3677fe9b6ed58d56d2' 
  AND token = 'UdR31scKu9NsozZbAo5SzIFM5zET6MvX1geR0JF46LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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