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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3402cc7ffdf7e891c76a3a9a465c697fb708058b377a94d06f91a3c2b603ef72' 
  AND token = 'UVA/dnld2nUTHBf+j+195GC17iO1xLPhzuW66L7+6Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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