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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8be916658ddc0ae1e822f534f73f6a6ff7d6d255062cdee6b11f4501255dadd' 
  AND token = 'aCLwqo3C4LvyC5wiWitrex0SwObuupYfUzPFRBoD5vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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