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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd799e3e35654f71dfcaac190e9b35302b21b288c94933f84274e71654061c9cd' 
  AND token = 'g0Vk1Lb8/rO5+BcOv4nOlO1faGEQT9tkUwY+9SbyiQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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