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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c9719100cfb4457f0263c67c77c79f1f00ec61911a7d8115a5329aa779ccf1' 
  AND token = 'HloAZ4HBa08YEkCg/un5m38uG0aSVvLvOa1d6yp+68Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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