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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8615540003152138f00e705e731678ec7d037f527e4ab946c9501e5ed7d7e20' 
  AND token = 'XF0U80Otx2Q8aLW6lBBKfwESO6HPJ3DK2GBKLzU9//4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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