SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec3a0b63fb9ab6fe246512f8cb479f179f51db98b398a01819d7c3dd81d6b23' 
  AND token = 'd26CsLjrc5NPA67gvWRFTY+qy1zh+lPVDtK/Q5F6m8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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