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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7796805cddbc3ec6b772642ce6a8910c6f79fe1d8d0140381ab6d0606f0482a6' 
  AND token = 'SEnOiIHKupaq/QFzYItosQNfWQ2NmCJkTxvfGHvovrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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