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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068937153ee807a289a3771641eac59ab59a9fcd71686da05a558a8859e9e6a3' 
  AND token = 'wlmDurrFmYlaiAaraRxtWU4rp13i0cyGjg+e/9G565o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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