SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc281c9ed4943a7bac49c6d3b930bdb3bffff3fec5204fef1cd3d2bc5158a0a' 
  AND token = 'J52jYF9pPFmLNV/xGrOiXyYAKLUzXQ+yLwVjl249xGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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