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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38be0eb221326e4e616d75cb31492b9172f12aa5f7973babda03e013343d747' 
  AND token = 'GVaAM1210XV82N7MKA42zYZB3m9EOBkA5QVpmbPX00M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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