SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd739782d9ce5ffea9822c37574525ff8579c314bfa66dd92c8808ced64b30c' 
  AND token = 'vSIGO2vgilYXDrrB1pDpRJyH15wh3WwaJkohCTqcepE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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