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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc0c85041a8318c3eafd5dfecf76e220360333cd8eb17f5f24bc32f2739737f' 
  AND token = 'O6I/SpKIQiZb4/ymy0a6MVEDjd6CqAySny3CD7gf8EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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