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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a44dcd8f1b363292fd9d5bbc5de39a42b9ac08351102141d4e855cd7ff35b3' 
  AND token = 'gPuu0bStB1rqesDrpdTevhe7MU53ZDa0QosoC5Yi/Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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