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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec84658c000e9f1b2f17e7fc9b5081efe6eb15231143bd335806b3b87698e33' 
  AND token = '7d/MDyFZ/2gXpvpfxrdKUvBhN96ZAzmoG5zE/K8mupk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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