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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de34584d1a64ac74f563bcae4e75e6d2ea22f266a77c85d5f181fc3fc0cc2652' 
  AND token = 'TNr8pq+H45DEL14o3Li8pjqtgnoXVH8dzrvtKjVj7pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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