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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d6ac4ab63916d56e0014e1bceefdcb47b96194a078b392efd71eb380b180d3' 
  AND token = 'MS+1Zpj+wNFxEZ8vrWacZL7l3mQRqQEfqBcpl7j1JgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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