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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e8bef2faae78453eb3e4152564323ae9160b6d6e00504fa46f2860dbe7eb5a' 
  AND token = '5CNZisbqfv1uJIn4G8zt/ekLOuHTbA8ZJ9RYlHnd6Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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