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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e673556d6c3dd30365465746d559587dd74a2ed9b136d87560e1d4ef6c0af05' 
  AND token = 'duHnKRHX8iFvAJQge2rcLvpULb2qsRSxJD83Y8gX0z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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