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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d729ded7038342f3d8d44e59597f4df20103c33f7c5da1613ee3e0d539827a' 
  AND token = 'Z9jWY4BA8h1jqyFJ0V9tdhl+SE33AgRQTm+nx5Knkm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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