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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8383ee690ba79df348f4421b8bcde1a6020fb82d73446879b24d8d7d371832' 
  AND token = 'rnwgaoCSP9qOo1lHqz70kFs7jgOcUjohrOkxZQbY8w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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