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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6544f040882445eb7901ed882d74c524a0ec9e02ae7324f7c19d02e6ffbbd3ae' 
  AND token = '2t178G3KRxyJHAVJ6IROwjDbytxQFFU0ywqaRANS7AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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