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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1af31056ea1d6ad55e1105ae472f060c0567999165e12d12a25039bd69a98b' 
  AND token = 'Wo6jzw+WiAVRAYRc9lgAorKJg9bnTudz3VvWGsEvVoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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