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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ba212fc775e6d4572e09d20ad0ebeda4f2c4e31483ab3609edd7a80b9aa69a' 
  AND token = 'JXW4d1JTg64LI1G57CAGKVe7tsRSv5ebH/hwWFqdSq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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