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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca0cddb7c9e9e0d855b34df3ff63570f4b5e8e7526dbaefd805cb82a5e066e2' 
  AND token = 'pWg5nWZlGPn7ptJns5SLMFO6xiS3Xu8Gx4ytTOHBkew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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