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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10944f9dfe68ad65e4b731f1b4f4f998fa21d0f40fb2b92fc54a7b4f6dfd11ab' 
  AND token = 'kXpaNAeTcWZHgC1lflqMOI2KN9AXeGPczL6zF6li9Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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