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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447e83736ebe94b56e7150757d44e71c5e8fb42e7627fd4544bd272a8907a276' 
  AND token = 'T7kIQCjCdXUdH8jCvqzXCG4eX+iLdGHhu2+A0u4TrQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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