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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437e462d89485481e2175b4ffba39a6b15348b2e88cd96f8212eb689324152c7' 
  AND token = '0Z0OnLcdbhT82Q+4t7YKtZiJKRL9HMRaFsPfpxbjwDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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