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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d503d15646ce996d0de2e42bc6866a1ed75adf35f1686d48726c31e887e2b80' 
  AND token = 'm9yJpQoY1ZKfOIPPyfbCJQJhWxngzw2nosPEsIGoUTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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