SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82849c6046b1631c226244dfe6a59e55048c7cc1b94d8ebd5be59ce71e6cbff9' 
  AND token = 'BYZmJMtqCSFFzNGUhcuBFjLi4GRD0ly4cZwbEMg3rLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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