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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ffade9964be97a0568878f2f907ef1ff90464103ef7728f76899e5badf25d7' 
  AND token = 'MoeXRoIia4sthQI6sRI6PUDs0/WL7+e0hKj29v1+Ovk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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