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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d94a4aee93e5238ac71ddf1d272d829e78c01708e02e2d4660ede0ed5b2103' 
  AND token = '/z1syhTlCdiT00oi9tp/iIotxm4KciUB07KPkbAr2Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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