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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82523e817f137144c0d802dee463eef2c919823b601ef564d37d6cda7c3c05f7' 
  AND token = 'LXmx3BqDQgxwZLbd6VZLvv0v+9oqso9XiSxE8dg58u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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