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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367470dfbeffe1a944deb4c0b82e92b8db10e1e42f56bc3d27e7c755549f3af3' 
  AND token = 'qha8hSPFdzBSWXrsfDJRlxS0DDMAIN+n0IQfFQRVPeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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