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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a75fff7368daa3c708121d637710787f16a52bf5373d5dac7c074c139b6415' 
  AND token = 'EKA1Vn869W1yxKb2Y9Z4xUNoP86P2V60RpoW6kjSleU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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