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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3825c47f6f7c156c8f702b7e7330d2985634a5195c28fa737ce46cdf42ad735b' 
  AND token = '2GMaQZUg5oLXkpe8Ut/Art7UGk5a3YGL2Z8V0jhRihM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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