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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a4f7b4da1c7fdc5d91ae38fa23ed450cc550dd1d316fdd5bd890eb18fec584' 
  AND token = '/ZTIJns2xmTvHLkoVzkWIDPE0ObHnns5cg4LkDf9IzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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