SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1f062dd232eff16612a369a420d74d27715f92e1d2fd8da3a61760da02ac65' 
  AND token = 'Djn2Eib54l6t47H2/tX/zxC2OlGxUjq3e4Wa2toImEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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