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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b9d2d0b31b8e15679a011b2389ddf6af5e5722a44c4e2a0c9dc55ebb42a708' 
  AND token = 'iW4KS9NHKBVRqgJUiC4LeP/pQeF39MqqWjVTeCfNbB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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