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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dc8eac6822fe7b059fe728a4415a46175bc71c27afb607bb6ec52e11c1be9b' 
  AND token = '/1ouCV0Ve4yYSt+jfQ+JmhgtuDvQmTeYLkHgrWC9nyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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