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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784e1becb868446294c6a37dc7878fb81df65b85fb9a8dbe7cbc13745b643279' 
  AND token = 'QT5r13rfAYdTTaCn65yafDI82d142bO7eAOXpkdA02Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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