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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c56d844db291d6bc06a16790f36e589a44cf8dadd1bc162af911996526aa776' 
  AND token = '+ciSOXOMMcw/RSvheuuw9jFvk90spgIWypaTG2NKVu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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