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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56254aaf92466fa9237f741009adb6bf498080aa0b7342cf93af671e5fa7523f' 
  AND token = 'iT9+qb9zUixS5acHptPVauqC8WsV/nArJS2x6sdyTNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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