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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbce91ec16a0bf62fd2646f7f6b59b522dc21a88532993a59654cf5e2a55e52' 
  AND token = '+L/ZOtQFJN+XsoPqK+s4gntgcCqA+QJbgQubAtXx5P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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