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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9160eb65b04527935f80d6c66102c3f93d56dd5702be679ed605959f9f6ed7' 
  AND token = '8iAxHiv9F0w3euZh5Wr0CSqImiUUFM01MU9++AGoMXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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