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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ada56d96c134375616bbc0b95ea115bc8ce185e57bc21d3df7984f415e0988' 
  AND token = 'Duc7iFD0zgNHtir5XNUrPBzSMFOx8vNQAYHRXhV2lX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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